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Adjust racks to top and middle positions and preheat oven to 425 degrees. Bring garlic herb butter to room temperature. Wash and dry produce.
Halve potatoes lengthwise; toss on a baking sheet with a drizzle of oil, salt, and pepper. Roast on top rack until browned and tender, 20-25 minutes.
Meanwhile, arrange sausage* on a separate lightly oiled baking sheet. Roast on middle rack, turning sausage halfway through, until browned and cooked through, 15-17 minutes.